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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $)
3 Months Ended 1 Months Ended
Mar. 31, 2015
item
Mar. 31, 2014
Jul. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Change in Accounting Estimate          
Net book value $ 184,210,000us-gaap_PropertyPlantAndEquipmentNet       $ 180,271,000us-gaap_PropertyPlantAndEquipmentNet
Net income 4,043,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 3,276,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic      
SEGMENT INFORMATION          
Number of operating segments 2us-gaap_NumberOfOperatingSegments        
Number of reportable segments 1us-gaap_NumberOfReportableSegments        
Monarch Black Hawk Parking Structure          
Change in Accounting Estimate          
Net book value       4,800,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mcri_MonarchBlackHawkParkingStructureMember
 
Estimated depreciable life     P18M P37Y  
Monarch Black Hawk Parking Structure | Service Life          
Change in Accounting Estimate          
Estimated depreciable life       P15M  
Monarch Black Hawk Parking Structure | Correction | Service Life          
Change in Accounting Estimate          
Net book value     2,900,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ServiceLifeMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mcri_MonarchBlackHawkParkingStructureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
   
Depreciation expense per month     200,000mcri_DepreciationPerMonth
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ServiceLifeMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mcri_MonarchBlackHawkParkingStructureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
300,000mcri_DepreciationPerMonth
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ServiceLifeMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mcri_MonarchBlackHawkParkingStructureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
 
Depreciation expense net of tax per month     100,000mcri_DepreciationNetOfTaxPerMonth
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ServiceLifeMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mcri_MonarchBlackHawkParkingStructureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
200,000mcri_DepreciationNetOfTaxPerMonth
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ServiceLifeMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mcri_MonarchBlackHawkParkingStructureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
 
Depreciation expense 500,000us-gaap_Depreciation
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ServiceLifeMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mcri_MonarchBlackHawkParkingStructureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
       
Net income $ (300,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ServiceLifeMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mcri_MonarchBlackHawkParkingStructureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
       
Basic and diluted earnings per share (in dollars per share) $ (0.02)us-gaap_EarningsPerShareBasicAndDiluted
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ServiceLifeMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mcri_MonarchBlackHawkParkingStructureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember